Automobile engine carburetor choke valve



Jan. 16, 1951 M. J. KlTTLER ET AL AU TOMOBILE ENGINE CARBURETOR CHOKE VALVE Filed NOV. 6, 1948 r m 8 T. firm f f K w M m NW 6 M %W x w WM AT 7' GENE Y ,nected to a float chamber l5.

Patented Jan. 16, 1951 AUTOMQBILE ENGENE CARBURE'EOR CHOKE VALVE Milton J. Kittler. Detroit, and Arthur G. Winter,

Pleasant Ridge, Mich, assignors to George M. Holley and Earl Holley Application November 6, 1948, Serial No. 58,748

Claims.

The object of this invention is to improve the distribution of fuel in the venturi of an automobile type engine carburetor.

Additional objects are to lower the cost of an ordinary automobile carburetor and to reduce its overall height.

We have discovered that by locating the but -terfly choke valve in the throat of the venturi we reduce the overall height and thus reduce the cost. At the same time we improved distribution as the butterfly choke valve, we found, formed the very best type of fuel distributor when the fuel was discharged along the downstream side of the shaft of the butterfly choke valve.

Fig. 1 shows a cross-sectional elevation of the preferred. form of our invention.

Fig. 2 shows a cross-sectional elevation on plane 2--2 of Fig. 1.

Fig. 3 shows an alternative form of the choke valve.

I Fig. 4 shows a cross-sectional elevation on plane 4 i of Fig. 3.

Fig. 5 shows still another alternative form of the choke valve and shaft.

Fig. 6 shows a cross-sectional elevation on plane 65 of Fig. 5.

Figs. 7 and 8 show another form of the choke valve in which inclined grooves are used.

In the Figures 1 and 2, i5 is the air entrance, I2 is the choke valve or throttle mounted on shaft I l located in IE which is the throat of the venturi.

l2, are in line with the fuel outlet passage 2i) which draws fuel from fuel well 22, which draws its fuel from a fuel restriction 28 (Fig. 1) con- Air is admitted at air vent 2% down a tube 24.

A choke throttle shaft bushing 36 is cut away Grooves i! and E8, in choke or throttle to form the segmental fuel outlet passage 28 in vided to break the syphon.

In Figs. 3 and 4 grooves 58, in the choke valve 52, help distribute the fuel and are located on both sides of the choke valve 52.

In Figs. 5 and 6 a slot 54, in choke throttle shaft i 1, serves as a fuel outlet and increases the area of the fuel outlet 2%. An automatic suction relief valve 58, on the downstream side of the choke valve 56, also serves to improve distribution when the choke valve is Wide open. The eddy back of the valve spring draws the fuel into the middle of the air stream.

In Figs. 7 and 8 the inclined grooves 59 and 60 have also been found beneficial to improve distribution.

Operation In Figs. 1 and 2 low speed operation is well known and need not be described. When the choke valve I2 is wide open as shown, fuel flows from the float chamber l6, through restriction 28 and out through the segmental passage 29 and along the grooves I1 and Hi. It finally leaves the downstream lip of the choke valve l2 as a fine spray.

As it issues it is caught by the eddy created by the choke valve shaft H and the plate H2. The fuel is immediately atomized and distribution is thereby improved.

What we claim is:

l. A carburetor having a mixture chamber, a mixture outlet, a throttle valve in said outlet, an air entrance to said mixture chamber, a venturi in said chamber adjacent said air entrance, a

venturi and discharging at the periphery of said choke valve so as to discharge along both sides of the downstream portion of said choke valve when said choke valve is substantially fully open and transversely of said venturi and downstream of said shaft and closely adjacent thereto.

2. A device as set forth in claim 1 in which there are grooves in said choke valve parallel to the shaft and adjacent the downstream side thereof so as to guide the fuel into the middle of the airstream.

3. A device as set forth in claim 1 in which there are grooves in said choke valves at right angles to the shaft and located downstream from the said shaft.

l. A device as set forth in claim 1 in which there is a groove in said shaft located downstream thereof and adjacent said fuel passage so as to guide fuel into the middle of the airstream.

5. A carburetor having a mixture chamber, a mixture outlet, a throttle valve in said outlet, an air entrance to said mixture chamber, a venturi REFERENCES CITED The following references are of record in the 15 file of this patent:

Number 4 UNITED STATES PATENTS Name Date Edwards Apr. 4, 1922 Feroldi May 17, 1927 Schley May 7, 1929 Ensign July 23, 1920 Bicknell Aug. 16, 1932 Townsley Mar. 13, 1934 Sladky Aug. 5, 1941 Beard July 6, 1943 

